Experiment F: Analysis Of Vitamin C In Tablets And In Tang

Question 0

What does the stoichiometric point represent in a titration?

Answer 0

The point at which the amounts of acid and base are in stickup metric proportions (ie- they are exactly in the correct mole ratio such that neither of the reactants remain after the reaction is complete) also known as stochiometric factor

Question 1

Vitamin C is water soluble due to:

Answer 1

Formation of hydrogen bonds between it’s (-OH) and (C-double bond-O) groups and the (-OH) of the solvent molecules

Question 2

What is the molecular formula of Vitamin C?

Answer 2

C6H8O6

Question 3

What is the molecular formula of iodate?

Answer 3

IO3-

Question 4

When the solution of vitamin C, KI, HCl and a few drops of starch solution is titrated with KIO3 the following steps occur:

Answer 4

A)iodate anion reacts with I- and H+ to form I2 (each iodate forms 3 I2)
B)I2 is reduced immediately by vitamin C back to I- (each iodate causes reaction with 3.vitamin c molecules)
C)after all if the vitamin C has been consumed I3- is formed
D) the I3- reacts promptly with starch to produce blue black indicator

Question 5

The reaction with iodate is specific to the ______ part of the vitamin C molecule

Answer 5

Ascorbate

Question 6

The reaction with NaOH will also react with any sufficiently ___________ present.

Answer 6

Acidic protons of any acid